Aquarium backgrounds

Does anyone know some cool ways to make natural appearing backgrounds for an
aquarium? Am interested in a mud bank or amazon appearance.

The ones I saw were available from a company but very expensive. $200-400
range. I think a person can make one for way cheaper that is 3D and real
cool. Any ideas would be helpful.
thanks

Dan

In article <421a0130$0$6167$afc38c87@news.optusnet.com.au>,
ivsmith11 RemoveThis @hote-mail.com says...
> I got a A$5 piece of 2" thick styrofoam (4X6 ft) from a recycling place and
> cut out a panel which was the same dimensions as the rear pane of glass on
> the tank (122cm X 50cm).
>
Just a note. Structural (insulating) foam is used quite a bit in model
railroading (another hobby of mine) to create scenery. The best way to
shape it is with a hot wire cutter. Next best is a serrated knive and a
surform tool. But keep the shop vac handy :-).

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Homo sapiens is a goal, not a description